c-99 FDNY (CNG) COMPRESS NATURAL GAS EXAM
QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2025|2026 Q&A |
INSTANT DOWNLOAD PDF
Alcohol blended motor fuel - -answer- Gasoline blended with ethanol or other
alcohol l concentration greater than 15 percent by volume
other emergency shutoff systems - -answer- Excess flow valve and other shutoff
system must be provided in dispensing system lines to provide for emergency
shutoff in the event of pipe breakage, hos rupture or hose separation from
dispenser.
Control Booth(applicable only to self service CNG Stations) - -answer- The control
booth shall be an interior or exterior enclosure to which public has no access.1.
the certified attendant shall be present within the control booth while dispensing
operations are conducted.2. Audio and Visual alarms that are required for CNG
stations shall actuate within the control booth.3. A properly labeled manual
switch that activates the emergency shut-down device shall be located within the
control booth.4. A console that controls the self service CNG motor fuel
dispensers shall be provided within th control booth and within 5 feet of the
emergency shut down device manual switch.5, Approved self service devices,
equipment and systems such as, but not limited to, card operated and remote
reset types, are allowed at CNG motor fuel-dispensing facilities. The certified
attendant shall set the dispensing devices in the off position when not in use if
,such dispensing device can be activated without the certified attendant's
knowledge.6. A two way voice communication system shall be installed to provide
contact between the control booth and each dispensing island.7. The control
booth shall be designed and located so that the certified attendant stationed
there in shall have a full, unobstructed clear view of dispension operations.
Control Booth requirements - -answer- 1. Housekeeping, keep booth clean 2.
operating manual 3.Portable fire Extinguishers
shut down operations - -answer- Manual valves ,remote manual valve , automatic
shutoff valve, emergency shutdown switches out doors 75 feet but less than 25
feet from fuel dispenser
Remote manual shutoff valve - -answer- C-99 Certicte holder must make sure that
the valve is protected against physical damage and kept accessible at all times.
shut down - -answer- An approved sign shall be posted on or immediately
adjacent to such switches and shall read: EMERGENCY CNG SHUTOFF
CNG Stations - -answer- The NYC Fire Department recognizes and approves the
use of three types of CNG stations in New York City: stationary stations, mobile
stations, and mobile cascades.These stations are used to dispense CNG at
regulated pressures into DOT approved cylinders or containers.
Stationary CNG Stations - -answer- Stationary CNG are commonly installed in
utility companies or other locations deemed suitable by the fir commissioner,
including automotive service stations, bus depots, and fleet garages. The
Stationary CNG station consists of an assembly of components, which include a
compressor ,a dispenser, valves and piping, and storage system.
, The compressor - -answer- is used to draw the gas from distribution pipeline and
compress it into the storage system. Then the CNG id dispensed from the storage
system into cylinders mounted on motor vehicles. Fire Department regulations
require stationary CNG stations to be located outdoors at grade level.
Mobile CNG Stations - -answer- A mobile CNG station consists of an assembly of
components, which includes compressors, cylinders and dispensers, mounted on
a motor vehicle.Mobile stations are designed to draw CNG supply source and
dispense it into motor vehicle mounted cylinder(s). Several Fire Department
regulations must be obeyed when operated mobile CNG stations.
Design and installation Requirements - -answer- Label reading"MANUAL
CYLINDER SHUT OFF VALVE" in lettering a minimum of 1/2" high shall be placed
on the appropriate access doors. hoses, hose connections, dispensers, gas
detection systems and electrical equipment used for CNG shall be listed. Vehicle-
fueling connections shall be listed and labeled. 1. Vehicle fueling hose shall be
compatible with CNG and shall withstand a pressure of at least four times the
service pressure.Hoses shall be designed as to be protected against physical
damage. 2. Hoses shall be checked for leaks with noncorrosive solution or
equivalent leak detection method at least annually by a certified attendant and
shall be replaced if damaged.
Fire Safety Precautions - -answer- A. Mobile CNG motor fuel system may only be
operated outdoors.B. The engine and ignition system of the mobile CNG motor
fuel system and motor vehicle into which CNG is being dispensed shall be off
during dispensing operations. The compressor may remain active during
stationary operations. C. The wheels of such mobile systems shall be chocked
during compressing or dispensing operations. D.Motor vehicles into which CNG is
being dispensed shall be electrically bonded or grounded to the mobile CNG
motor fuel system. E. A cellular telephone by which fires or other emergencies
maybe reported to the fire department shall be provided to the certificate of
QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2025|2026 Q&A |
INSTANT DOWNLOAD PDF
Alcohol blended motor fuel - -answer- Gasoline blended with ethanol or other
alcohol l concentration greater than 15 percent by volume
other emergency shutoff systems - -answer- Excess flow valve and other shutoff
system must be provided in dispensing system lines to provide for emergency
shutoff in the event of pipe breakage, hos rupture or hose separation from
dispenser.
Control Booth(applicable only to self service CNG Stations) - -answer- The control
booth shall be an interior or exterior enclosure to which public has no access.1.
the certified attendant shall be present within the control booth while dispensing
operations are conducted.2. Audio and Visual alarms that are required for CNG
stations shall actuate within the control booth.3. A properly labeled manual
switch that activates the emergency shut-down device shall be located within the
control booth.4. A console that controls the self service CNG motor fuel
dispensers shall be provided within th control booth and within 5 feet of the
emergency shut down device manual switch.5, Approved self service devices,
equipment and systems such as, but not limited to, card operated and remote
reset types, are allowed at CNG motor fuel-dispensing facilities. The certified
attendant shall set the dispensing devices in the off position when not in use if
,such dispensing device can be activated without the certified attendant's
knowledge.6. A two way voice communication system shall be installed to provide
contact between the control booth and each dispensing island.7. The control
booth shall be designed and located so that the certified attendant stationed
there in shall have a full, unobstructed clear view of dispension operations.
Control Booth requirements - -answer- 1. Housekeeping, keep booth clean 2.
operating manual 3.Portable fire Extinguishers
shut down operations - -answer- Manual valves ,remote manual valve , automatic
shutoff valve, emergency shutdown switches out doors 75 feet but less than 25
feet from fuel dispenser
Remote manual shutoff valve - -answer- C-99 Certicte holder must make sure that
the valve is protected against physical damage and kept accessible at all times.
shut down - -answer- An approved sign shall be posted on or immediately
adjacent to such switches and shall read: EMERGENCY CNG SHUTOFF
CNG Stations - -answer- The NYC Fire Department recognizes and approves the
use of three types of CNG stations in New York City: stationary stations, mobile
stations, and mobile cascades.These stations are used to dispense CNG at
regulated pressures into DOT approved cylinders or containers.
Stationary CNG Stations - -answer- Stationary CNG are commonly installed in
utility companies or other locations deemed suitable by the fir commissioner,
including automotive service stations, bus depots, and fleet garages. The
Stationary CNG station consists of an assembly of components, which include a
compressor ,a dispenser, valves and piping, and storage system.
, The compressor - -answer- is used to draw the gas from distribution pipeline and
compress it into the storage system. Then the CNG id dispensed from the storage
system into cylinders mounted on motor vehicles. Fire Department regulations
require stationary CNG stations to be located outdoors at grade level.
Mobile CNG Stations - -answer- A mobile CNG station consists of an assembly of
components, which includes compressors, cylinders and dispensers, mounted on
a motor vehicle.Mobile stations are designed to draw CNG supply source and
dispense it into motor vehicle mounted cylinder(s). Several Fire Department
regulations must be obeyed when operated mobile CNG stations.
Design and installation Requirements - -answer- Label reading"MANUAL
CYLINDER SHUT OFF VALVE" in lettering a minimum of 1/2" high shall be placed
on the appropriate access doors. hoses, hose connections, dispensers, gas
detection systems and electrical equipment used for CNG shall be listed. Vehicle-
fueling connections shall be listed and labeled. 1. Vehicle fueling hose shall be
compatible with CNG and shall withstand a pressure of at least four times the
service pressure.Hoses shall be designed as to be protected against physical
damage. 2. Hoses shall be checked for leaks with noncorrosive solution or
equivalent leak detection method at least annually by a certified attendant and
shall be replaced if damaged.
Fire Safety Precautions - -answer- A. Mobile CNG motor fuel system may only be
operated outdoors.B. The engine and ignition system of the mobile CNG motor
fuel system and motor vehicle into which CNG is being dispensed shall be off
during dispensing operations. The compressor may remain active during
stationary operations. C. The wheels of such mobile systems shall be chocked
during compressing or dispensing operations. D.Motor vehicles into which CNG is
being dispensed shall be electrically bonded or grounded to the mobile CNG
motor fuel system. E. A cellular telephone by which fires or other emergencies
maybe reported to the fire department shall be provided to the certificate of
